/Engine/Source/Runtime/Core/Public/Misc/CoreDelegates.h
Thismaybe called when the application is getting terminated by the OS. There is no guarantee that this will ever be called on a mobile device, save state when ApplicationWillEnterBackgroundDelegate is called instead.
static [TMulticastDelegate](API\Runtime\Core\Delegates\TMulticastDelegate)< void()> ApplicationWillTerminateDelegate;